looking at the brochure for 91/92 and 92 /93 the appears to be no difference between the two except for the option of paint colour which included a radiant red and smokestone
the optional extras were only aircon and 2008 rds radio and cd player 2028
the heated seats were only an optional extra on the 92/93 escort cosworth
although my 92 saph has provision for the 2 switches on either side of the handbrake. i.m sure you could have had ford fit them on buying the car or even fit them your self as there only a heater blanket stuffed into a cavity in the seat
i think the owners manual give a small discription and opperation of them,